Grinding-machine.



N0.881,465. PATENTED MAR; 10,- 1908.

- M. DIGKERSON GRINDING MACHINE.

urmonxon FILED OCT. 4, 1905.

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No. 881,465. PATENTED MAR. 10, 1908, M DIOKERSON GRINDING MACHINE. APPLICATION FILED OUT. 4, 1905.

3 SHEETSSHBET 2.

WHIEDEMTIEKEI'SDI], flaw ATTOR EV ITo. 881,465. PATENTED MAR. 10, 1908. M. DICKERSON.

GRINDING MACHINE.

APPLIOATION FILED T.4 1905.

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MALCOLM DIGKERSON, OF

Too/ll uihom it may concern:

UNITED STATES PATENT enema NEWARK, NEW JERSEY, ASSIGNQ'R OF ONE-HALF TOFREDERICK L. LUZ, QF NEWARK, NEW JERSEY.

GRINDING-MACHINE.

No. seines.

Speciflcatio'n'ot Letters Patent.

Patented March 10, 1908;-

Application filed. 0mm 4,1905. Serial No. 281,2;5.

Be it known that I, MALCOLM DIGKEBSON, a citizen of the United States, residingat Newark, in the county of Essex and State of NewJersey, have invented certain new and useful Improvements in Grinding-Machines and I do hereby declare the following to be-a full, clear, and exact description of the invenon, such as will enable others skilled in the it to which it appertains to make and use the same, reference being had to the accompan g drawings, and to letters of reference mar ed thereon, which form a part of this specification. v Q

My present invention relates to improvements generall in grinding machines; and the invention as reference, more particularly to an arrangement of cushion mountings for grinding machines, with this main object of the invention in view, that with a cushion-mounted rinding or emery wheel or disk, a flexible and vibratory relation is pro- "duced between thegrinding surface of the wheel and-the work which is being ground, thereby resulting in many advantages to both the grinding or" emery Wheel and the work, as will hereinafter more fully a pear.

This invention has for its principal 0 j sets to provide a novel means for mounting a grinding or emery wheel or diskupon a shaft, the mountings and grinding-wheels or disks bein cushioned in such a manner, that a simp e and chea arrangement of the parts is produced, wit a view of removing from the grinding-wheel or disk and the work sud.-

' den shocks incident toany unevenness between the work and the grinding surface of thewheel or disk, orowmg to any harder part existing in the casting or body of such work which has to be ground. 1

My invention has for its further oses, the prolongation of the life of grlnding or emery wheels, by the useof cushlon mountings as shown and hereinafter more fully set forth, and a consequenttredu'ction of care and labor required and caused by the consequent s ringm of the shaft and other (parts,

where t e grin ing or emery wheel or skis rigidly secured u on the shaft. rangement of cus ion-mountings, as hereinafter set forth, the life of the grinding or emery wheel or disk is doubled, requiring less truing up than does a rigidly mounted wheel or disk, and consequently resulting in a grinding. orf

By an arinafter set forth, comprising asleeve running in bearings with fixed centers, a shaft running through the sleeve, and normally COllcentric therewith, a clearance-s ace between the shaft and sleeve to allow of ateral movement of the shaft relative to the sleeve, and

suitable source of energy or driving means for imparting rotary motion to the said sleeve, a flexible cou ling .or mounting between said sleeve an shaft to impart motion to the shaft, and a flexibly-mounted grinding or emery wheel'or disk, all for the purposes to be hereinafter more particularly described.

Other objects of the present invention note at this time more particularly specified will be clearly understood from the following detailed description of my invention.

The invention consists, therefore, inthe novel cushion-mounted .or flexible grinder hereinafter more fully set forth; and, further more, this invention consists in the-various,

no'vel'arrangements and combinations of. devices and parts,,as Well as in the details .of the construction of the same, all of which will be hereinafter more fully described, and then finally embodied in the clauses of theclaim which are appended to and which forman essential part. of this specification.

The invention is clearly illustrated in the accompanying drawin s, in which-:

Figures 1 and 2 are a ont view and side elevation, respectively, of one form of grindingmachine provided with a cushion mounted emery-wheel, embodying the princip my present invention. ig. 3 1s a view, on an enlarged scale, of the casing of a, grinding machine, and. the cushionmounted. grinding. or emery wheel or disk, certain parts being shown in elevation and other arts being represented in section. Fig. 4 is a .detail sectional representation, on a still larger scale, of a P01171011 of the casing of the machine, the cushion mountin .for the grinding or emery wheel or disk, an an endportion of the main shaft on which said parts are arran ed, said shaft being shown in ele Vation. igs. 5 and 6 are two elevations of grinding-machines provided with cushionmounted grinding or emery wheels, but showing two other main sourcesof energy.

or driving means, different from thatindicated' in the construction of machine represented in said Figs. 1 to-4 inclusive.

Similar characters of reference are em-;

Figs. 1: to 4 lnclusive com rising a suitable casin or shell 2 formed wit end-pieces 3 and suita le bearings 4 centrally secured to said I of the drawings end-pieces 3 by means of bolts or screws-5, or in any other suitable manner.- Within each bearing 4 are a air of ball-bearin rings 6 and 7, with anti-friction balls or ro era 8 between them, said ring'7 bein suitably slipped upon a slightly taper endportion 10 of a sleeve or tube 9, and suitably secured against a shoulder 11 of said sleeve or tube 9, substantially as illustrated in Fig. 4 Rotary motion of this sleeve or tube 9 is produced by means of an suitably constructed motor, as 12, .which 1s arranged within the said casing or shell 2, and as shown in I Fig. 3 of the drawings. Concentric with the said sleeve or tube 9 is a main shaft .or spindle 13 the parts being so "conveyed through the cushion 16 and the dis 16 is compacted between the arranged that there be an air-space between them, substantially as shown The means for producing a rotary motion of the said shaft 13 is a cushion mounting compris ing a pair of flanged disks or plates 14 and 15 with a soft flexib ering 16 of rubber or other analogous material placed between the said disks orplates 14 and 15. The said disk or plate 14 1s suitably secured u on the end of said sleeve or tube 9, while t c said disk or plate 15 is arran ed and secured upon the said shaft or spin e 13 substantially in the osition shown in said i .1, 3 and 4 of the awings. The said flexl 1e or cushion at faces of said two disks or plates 14 and 15 and'by the frictional contact or engagement between the faces of the said parts, the rotary motion of the sleeve or tube 9 and its disk or plate 14 is @ency of saidring or or-plate 15 to the shaft or spindle 13. The said disk or plate 15 is also provided with a hub 17'having a receiving socket 18, the internal diameter of :Which is slightly larger than the diameter of the said shaft or spindle 13. Suitabl arran sh or s indle 13 is another disk or plate 20, said disk or plate being provided with a hub 21 having a'receivi'ng socket 22. The

internal diameter of said receiving socket 22 is also slightly larger than the diameter of the shaft or spindle 13, substantially as shown. Concentric with the said main shaft or spindle 13, and forming an .air-space with said shaft or spindle, is another sleeve or tube 23,

having its respective ends snugly fitted in the near the free end-portion 19 o said said sockets 18 and 22 of the respective disks or plates 15 and 20, and then secured upon the shaft or s indle 13 preferably b means of pins 24. xtending 19 of the said shaft or spindle 13 is a stud or end-piece 25 formed integlrally with said endportlon 19, and

referab y provided with a screw-thread 26 or the rece tion thereon of a tightenin .nut 27. Suitably arran ed upon the sai stud or'end-piece 25 is anot er diskor plate 28, having a hub 29' against which the said nut 27 canbe screwed. Both of the said disks or plates 20 and 28 are re-- 'face of the grinding or emery wheel or disk,

with its circumferential ed es fitted beneath the flange 30 and the'shoul er 34 is a flexible rin or cushion 36 of soft rubber or other ana ogous' material and between the inner face 0 the disk or plate 28 and the other face of the grinding or emery wheel or disk, with its circumferential ed es fitted beneath the flange 31 and the shoulder 35 is another flexible ring or cushion 37 of soft rubber, or other analo one material. Thus it will be evident,

that t 0 said grinding or emery wheel or disk is' cushion mounted, and rotates with the 'main shaft or spindle 13 ,by thefrictional engagement between the several parts,bwhen the nut 27 is tightened against the hub of the disk 28.

An vibrato and etween t e glrindin surface o the wheel or disk and t e wor as well as that of the various partsof the devices being taken up b the cushionin devices, itwill be understoo that theprinmpal results will be action between the arts prolongation of the life of the emery .or

grinding wheelor disk, and a consequent reduction of care, with a larger output of work and greater ease and comfort to the workman.

Although I have described the grinding machine with but one arrangement of cushion mounted inder u on one end of the .shaftor spind e 13, it. Wlll be' clearly evident that the said shaft or spindle may be extended upon the other side of the machine and the grinding or emer wheel or disk and cushioning devlces dup icated upon said extended end of the shaft, as clearly indicated'in Fig. 1 of the drawings. In the device shown 1n said Figs. 1to 4 inclusive, the

shell or casing 2 forms the usual magnetic frame or yoke of the electric driving maom the en portion chine, the windings and'core of the armature of the electric motor being respectively, indicated by the reference-characters 38 and 39, and 40 indicates any suitable standard or base which extends from the said shell or casing'2.

Instead of,arranging the driving power in the -manner hereinabove described, the sleeve 9 of the shaft or slpindle 13 may be provided with a miter or evel-gear 4] and the'casing may be made in sections 42 and 43 which are suitably secured together; one of said sections, as 43, having an extension 44 provided with a motor, of an known construction, the shaft 45 of said motor having thereon a bevel or miter pinion 46 which isin mesh with the bevel gear 41',

. substantially as shown in Fig. 5 of thedrawchine havin in s.

n Fig. 6, I have illustrated the application of my invention to a grinding maa belt-driven shaft, the belt being passe over a suitable, pulley-wheel 47, at one end or other suitable portion of the main shaft ofthemachine.

. Having thus described my invention, I claim 1s:'

1. In a grinding machine, the combination, with a sleeve running in bearings with fixed centers, a shaft running through said sleeve, and normally concentric therewith,

what

means for imparting motion to said sleeve,

motion to said shaft, a grinding wheel, and a cushronanounting for mountlng said wheel a flexible coupling on said sleeve to impart on said shaft, substantially as and for'the' "R purposes set forth.

2 In a grinding machine, the eombination, with a sleeve running 1n bearings Wltll" fixed centers, a shaft running through said sleeve, and normally concentric therewith, said sleeve being provided with a clearance space between the same and said shaft to allow of a lateral motion of the shaft relative to sald sleeve, means for imparting rotary motion to the sleeve, a flexible coupling at the end of said' sleeve to impart motion to the shaft, a second flexible" coupling on said shaft, a second sleeve concentric i with said shaft, said second sleeve being connected at its ends with said fiexible couplings, and a grinding wheel mounted in said second flexible coupling, substantially as and for the purposes set forth.

In testimony, that I claim the invention set forth above I have hereunto set my hand this 23rd day of September, 19.05.

MALCOLM DICKERSON. 

